Detect stale-file-handle error in causal chain

Cover the case where the exception is wrapped up as a
cause, e.g., PackIndex#open(File).

Change-Id: I0df5b1e9c2ff886bdd84dee3658b6a50866699d1
Signed-off-by: Hongkai Liu <hongkai.liu@ericsson.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/FileUtils.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/FileUtils.java
index c04dfa9610..1f1d15b324 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/FileUtils.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/FileUtils.java
@@ -548,6 +548,26 @@ public class FileUtils {
 	}
 
 	/**
+	 * Determine if a throwable or a cause in its causal chain is a Stale NFS
+	 * File Handle
+	 *
+	 * @param throwable
+	 * @return a boolean true if the throwable or a cause in its causal chain is
+	 *         a Stale NFS File Handle
+	 * @since 4.7
+	 */
+	public static boolean isStaleFileHandleInCausalChain(Throwable throwable) {
+		while (throwable != null) {
+			if (throwable instanceof IOException
+					&& isStaleFileHandle((IOException) throwable)) {
+				return true;
+			}
+			throwable = throwable.getCause();
+		}
+		return false;
+	}
+
+	/**
 	 * @param file
 	 * @return {@code true} if the passed file is a symbolic link
 	 */